Meeting Abstract 31.3  Wednesday, Jan. 5  Tracheal Growth and Plasticity in 5th Instar Manduca sexta HELM, BR*; DAVIDOWITZ, G; University of Arizona; University of Arizona bhelm@email.arizona.edu In insects, oxygen is supplied directly to tissues through a network of branching trachea and tracheoles: tubules that branch inward from openings along the side of the body. The tracheal system […]

Meeting Abstract 31.1  Wednesday, Jan. 5  The Role of Atmospheric Oxygen in the Evolution of Insect Body Size VANDENBROOKS, John M.*; MUNOZ, Elyse E.; WEED, Michael D.; HARRISON, Jon F.; Arizona State University; Arizona State University; Arizona State University; Arizona State University jvandenb@asu.edu While not all models agree, most estimate that over the last 500 million years […]

Meeting Abstract 31.2  Wednesday, Jan. 5  Respiratory physiology and the initiation of molting in the tobacco hornworm, Manduca sexta CALLIER, V.*; NIJHOUT, H. F.; Duke University; Duke University vc12@duke.edu In Manduca sexta, the molting process is initiated when larvae attain a set size, the critical weight. Although the critical weight phenomenon is well documented, the physiological event […]

Meeting Abstract 31.4  Wednesday, Jan. 5  Interspecific Allometry of Cockroach Tracheal Systems and the Impact of Oxygen on Their Tracheal Development MUNOZ, E.E.*; WEED, M.; HARRISON, J.F.; VANDENBROOKS, J.M.; Arizona State University; Arizona State University; Arizona State University; Arizona State University elyse.munoz@asu.edu The factors limiting insect body size are still poorly understood. One hypothesis is the possession […]

Meeting Abstract 30.2  Wednesday, Jan. 5  The function of trabeculae in the accessory heart wall of squid BARBANO, Duane L.*; NISHIKAWA, Kiisa C. ; UYENO, Theodore A. ; Northern Arizona University db356@nau.edu An interesting question arises in surveying the diverse morphologies of hearts: Why is there so much variation in the three-dimensional structure of the luminal surface […]

Meeting Abstract 30.4  Wednesday, Jan. 5  Running guinea fowl prefer to expire at foot down: Coordination patterns of step and ventilatory cycles MARKLEY, J.S.; University of Utah markley@biology.utah.edu Sustained locomotion requires continuous lung ventilation. How birds coordinate cursorial locomotion and breathing is largely unknown. Locomotion and ventilation would be expected to be coordinated such that steps positively […]

Meeting Abstract 30.5  Wednesday, Jan. 5  Patterns of pressure in the thorax of a carabid beetle COX, L.M.*; SOCHA, J.J.; Virginia Tech; Virginia Tech lecox@vt.edu Many insect species are known to breathe using active ventilation of the tracheal system. Rhythmic tracheal compression (RTC) is one form of active ventilation in which parts of the insect’s tracheal system […]

Meeting Abstract 30.3  Wednesday, Jan. 5  Origin of the in-series circulation in amniotes OWERKOWICZ, T.*; SPIKINGS, T.; ELSEY, R.M.; HICKS, J.W.; UC Irvine; UC Irvine; Rockefeller Wildlife Refuge, Grand Chenier, LA; UC Irvine towerkow@uci.edu Among tetrapods, mammals and birds possess a derived in-series circulatory design. The capacity to shunt blood between systemic and pulmonary circuits, as found […]

Meeting Abstract 30.1  Wednesday, Jan. 5  Energetics of burrowing by the cirratulid polychaete, Cirriformia moorei DORGAN, Kelly M.*; LEFEBVRE, Stephane C.; STILLMAN, Jonathon H.; KOEHL, M. A. R.; University of California, Berkeley; Romberg Tiburon Center for Environmental Studies, San Francisco State University; Romberg Tiburon Center for Environmental Studies, San Francisco State University; University of California, Berkeley kelly.dorgan@berkeley.edu […]

Meeting Abstract 30.6  Wednesday, Jan. 5  Do gut movements induce tracheal collapse in carabid beetles? PENDAR, H.*; SOCHA, J.J.; Virginia Tech hpendar@vt.edu Some insects actively produce volume changes of the tracheal system to augment gas exchange. Respiratory tracheal structures (tracheae, air sacs, and tracheoles) are chitin-based membranous composites capable of deformation given sufficient pressure or mechanical force. […]